Create jira task: Unexpected token < in JSON at position 1

[Oleg Matiunin]

I have been successfully using api v2 for more than a year to create Jira tasks in a project. Without changing anything - today the create request stopped working. I can’t understand what the problem is.

jira ulr =  'https://my-domain.com/rest/api/2/isue/'
Node.js:

const response = await fetch(JIRA_URL, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
Authorization: `Bearer ${jiraToken}`,
},
body: JSON.stringify(issuerConfig),
})

Where 

issuerConfig is js object like : 
{
fields: {
... standart data that worked before many years
}
}

[Mohamed Benziane]

Hi,

Can you share the json that you are using ?